Minor man page corrections and fixups to document the difference between

tap and vmnet style devices.

Submitted by:	Vladimir

1 files changed, 41 insertions, 21 deletions

diff --git a/share/man/man4/tap.4 b/share/man/man4/tap.4
index fba5466..2f98473 100644
--- a/share/man/man4/tap.4
+++ b/share/man/man4/tap.4
@@ -147,23 +147,41 @@ Retrieve the process group value for
 signals into the argument
 .Va int
 value.
-.It SIOCGIFADDR
+.It Dv SIOCGIFADDR
 Retrieve the Media Access Control
-.Pq MAC 
-address. This command should be executed on descriptor, associated with
-control device
-.Pq Pa /dev/tap Ns Sy N .
+.Pq Dv MAC 
+address of the
+.Dq remote
+side. This command is used by the VMware port and expected to be executed on
+descriptor, associated with control device
+.Po
+usually
+.Pa /dev/vmnet Ns Sy N 
+or
+.Pa /dev/tap Ns Sy N 
+.Pc .
 The
 .Va buffer ,
-which is passed as argument, is expected to have enought space to store
-.Pq MAC
+which is passed as the argument, is expected to have enough space to store
+the
+.Dv MAC
+address. At the open time both
+.Dq local
+and
+.Dq remote
+.Dv MAC
+addresses are the same, so this command could be used to retrieve the
+.Dq local
+.Dv MAC
 address.
-.It SIOCSIFADDR
+.It Dv SIOCSIFADDR
 Set the Media Access Control
-.Pq MAC
-address. This command should be executed on a descriptor, associated with
-control device
-.Pq Pa /dev/tap Ns Sy N .
+.Pq Dv MAC
+address of the
+.Dq remote
+side. This command is used by VMware port and expected to be executed on
+a descriptor, associated with control device
+.Pq usually Pa /dev/vmnet Ns Sy N .
 .El
 .Pp
 The control device also supports
@@ -171,24 +189,25 @@ The control device also supports
 for read; selecting for write is pointless, and always succeeds, since
 writes are always non-blocking.
 .Pp
-On the last close of the data device, by default, the interface is
+On the last close of the data device, the interface is
 brought down
 .Po
 as if with  
 .Dq ifconfig tap Ns Sy N No down
-.Pc .
+.Pc unless the devices is a VMnet device.
 All queued frames are thrown away. If the interface is up when the data 
-device is not open output frames are always thrown away rather than 
+device is not open, output frames are thrown away rather than 
 letting them pile up.
 .Pp
 The 
 .Nm tap
-device is also can be used with VMware port as a replacement
-of VMnet device driver. The driver uses minor number to select between
+device is also can be used with the VMware port as a replacement
+for the old VMnet device driver. The driver uses the minor number
+to select between
 .Nm tap
 and
 .Nm vmnet
-devices. VMnet minor numbering is
+devices. VMnet minor numbers begin at
 .Va 0x10000 
 +
 .Va N . 
@@ -198,13 +217,14 @@ is a VMnet unit number. In this case control device is expected to be
 .Pa /dev/vmnet Ns Sy N ,
 and network interface will be
 .Sy vmnet Ns Ar N .
-Everything else is the same. 
+Additionally, VMnet devices do not ifconfig themselves down when the
+control device is closed. Everything else is the same. 
 .Pp
 In addition to mentioned above
 .Xr ioctl 2
-there are additional one for VMware port.
+there is one additional one for the VMware port.
 .Bl -tag -width VMIO_SIOCSETMACADDR
-.It VMIO_SIOCSIFFLAGS
+.It Dv VMIO_SIOCSIFFLAGS
 VMware 
 .Dv SIOCSIFFLAGS .
 .El